Stomach :(

Kinda long story but i'll be short, I had a four wheeler accident before my freshman year and was unconscience for a while. I went to the hospital and everything checked out, just a concusion. About 2 months later I was taken to the hospital for severe stomach pain and since then everything has gone to hell. They said I was fine but 8 operations and 1000 pills later I am still in great pain. They say I have acid reflux disease and they assume I have irritable bowel syndrom. My problem-- for the most part I can last through a regular day. 100% of the time when I wake up I feel stomach pain. My real question is about once a month I get an extremely bad stomach pain in which I undergo a type of diarrhea. This is the worse pain ever and it makes me scream like hell. This happens regularly without warning, and I have tried everything to stop it. Doctor has no idea what it is or what causes it. I tried taking more fiber and everything I can think of. I have been through every type of exploratory surgery and colon / intestine operation known to man. I just dont know what to do and its been 3 years and nothing. Anything advice is greatly appriciated. Thank you.